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If a giant needle-shaped mass of tungsten carbide (9540km in length, 3567km in width, moving at 99% of light speed) collided with earth, pointy end first, at the north pole, precisely what would happen to the earth, both geologically, meteorologically, and ecologically? Additionally, how would the results differ if the object collided at, say, the south pole, or the peak of the mid-Atlantic ridge?
Posting this here because I don't know where to put speculative scenarios in this forum. Sometime between the Paleocene and Eocene epochs, there was a mysterious, sudden, dramatic rise in global temperature. This moment in time was known as the "Paleocene-Eocene Thermal Maximum", shortened into "PETM". In just 20 to 50 millennia, the temperature rose by five to eight degrees Celsius, and this heatweave persisted for another 200 millennia (that's just the mean estimate.) While its impact on terrestrial plant and animal life is well-known, the focus of the question is on how the PETM i